摘要:
A system for lowering a subsea device from a vessel floating on a body of water. Means are provided to prevent the subsea device from striking the vessel as it goes through the sea-air interface. In a preferred embodiment, an access well means such as a tube extends downwardly through the vessel to below the wave action of the body of water. The outer wall of the subsea device is provided with roller members urged against the inner wall of the access well. Other means of moving a subsea device through the sea-air interface are also disclosed.
摘要:
HIGH CARBON DIOXIDE CONTENT E.G. 1-10% CARBON DIOXIDE BY VOLUME, HIGH PRESSURE HYDROCARBON FEED GASES ARE PROCESSED TO LIQUID ETHANE ESSENTIALLY FREE OF BOTH METHANE AND CARBON DIOXIDE WITH SIMULTANEOUS PRODUCTION OF LOW PRESSURE DISTRIBUTION GAS COMPRISING METHANE AND CARBON DIOXIDE WITHOUT CARBON DIOXIDE ICING TO TO FOUL EQUIPMENT BY TURBO-EXPANSION OF THE PRECOOLED FEED GAS AND STRIPPING THEREOF WHILE MAINTAINING PRESSURES THEREON AT WHICH NONGASEOUS CARBON DIOXIDE REMAINS DISSOLVED IN LIQUID HYDROCARBON. LIQUEFACTION OF THE ETHANE GAS IS ACHIEVED BY HEAT EXCHANGE WITH STRIPPER BOTTOMS. THE PROCESS THUS ACHIEVES MAXIMUM CONSERVATION OF HEAT AND POWER.
摘要:
NORMAL, PRIMARY DECANOL IS USED IN WATER-BASED, CLAYCONTAINING DRILLING FLUIDS AS A REPLACEMENT FOR OIL TO DECREASE FRICTION OF THE DRILL STRING AND FLOWING DRILLING FLUID AND TO REDUCE THE TENDENCY OF THE DRILL PIPE TO STICK TO THE WELL WALL DUE TO HIGHER PRESSURES IN THE WELL THAN IN THE FORMATION. PREFERABLY, THE ALCOHOL IS PURE, SYNTHETIC DECANOL. IT CAN BE USED AS BLENDS WITH OTHER LIQUIDS SUCH AS OTHER ALCOHOLS.
摘要:
TO AVOID ABNORMALLY LOW TEMPERATURES AND FLOW RATES IN A SULFUR PLANT WHERE HIGH TURN-DOWN RATIOS ARE ENCOUNTERED IN THE RECOVERY OF FREE SULFUR FROM HYDROGEN SULFIDECONTAINING GASES, THE ACID GAS STREAM IS BURNED IN A SEPARATE FIRING TUNNEL WITH ENOUGH AIR TO CONVERT ONETHIRD OF THE HYDROGEN SULFIDE INTO SULFUR DIOXIDE. TO SUPPLEMENT THE HEAT REQUIREMENTS AND NECESSARY GAS VOLUMES, A HYDROCARBON FUEL IN AMOUNTS UP TO ABOUT 20 PERCENT OF THE DESIGN ACID GAS FEED RATE IS BURNED IN A SECOND FIRING TUNNEL. THE PRODUCTS OF COMBUSTION FROM THESE SEPARATE BURNING STEPS ARE COMBINED AND DISCHARGED INTO A BOILER WHERE A PORTION OF THE SULFUR PRODUCED IN THE OVERALL PROCESS IS REMOVED AFTER WHICH THE RESULTING SULFUR DENUDED STREAM IS PROCESSED IN CONVENTIONAL FASHION.
摘要:
THIS IS A METHOD OF ATTACHING A CARBIDE RING TO THE OUTSIDE OF A STEEL TUBE SUCH AS A VALVE STEM. IT OVERCOMES THE PROBLEM CAUSED BY THE DIFFERENCE IN THERMAL COEFFICIENT OF EXPANSION BETWEEN CARBIDE AND STEEL. IN THE PREFERRED EMBODIMENT OF THE METHOD EMPLOYED, MOLTEN BRAZING COMPOUND AT A HIGH TEMPERATURE, E.G., 1,700*F., IS MELTED IN THE CLEARANCE SPACE BETWEEN THE CARBIDE RING AND THE STEEL TUBE. THE CARBIDE RING IS ALLOWED TO COOL TO ABOUT 1,000*F. WHILE THE STEEL TUBE IS KEPT HOT TO ABOUT 1,500* F. BY APPLYING HEAT TO THE INSIDE. A STEEL PLUG IS THEN PLACED INSIDE THE STEEL TUBE ADJACENT THE CARBIDE RING. THIS STEEL PLUG HAS BEEN SIZED TO HAVE A DIAMETER, AT ROOM TEMPERATURE, EQUAL TO THAT OF THE INSIDE OF THE STEEL TUBE IN ITS EXPANDED POSITION AT 1,000*F. AFTER THE PLUG IS INSERTED, HEAT IS NO LONGER APPLIED AND THE CARBIDE RING CONTINUES TO SHRINK AND TO DISPLACE THE EXCESS SEMI-MOLTEN BRAZING COMPOUND. THE STEEL TUBE ALSO STARTS CONTRACTING UNTIL IT CONTACTS THE PLUG. THE PLUG WHICH WAS PUT INTO THE TUBE AT ROOM TEMPERATURE, E.G., 80*F., HAS HEAT TRANSFERRED TO IT FROM THE STEEL TUBE AND THE PLUG ITSELF STARTS TO INCREASE IN SIZE. THE STEEL TUBE WHEN IT CONTACTS THE PLUG WILL BE AT LEAST AT 1,000*F. AND IS SOFT ENOUGH TO YIELD EASILY. AS THE TEMPERATURE OF THE STEEL PLUG INCREASES, IT CONTINUES TO EXPAND AND CAUSES ADDITIONAL YIELDING OF THE STEEL TUBE WHICH YIELDS SUFFICIENTLY SO THAT WHEN IT AND THE CARBIDE RING COOL, THEY DO NOT SEPARATE.
摘要:
This relates to a system of laying pipeline in deep water from a barge floating thereon. The barge has a vertical passage therethrough. A bearing means supports an elongated frame or rack above said passage and provides for pivotal movement in any direction. The elongated frame supports movable pipe gripping means, and pipe joint making means are supported on an endless belt for continuous operation. The proper restraint applied to the pipe, as the barge moves through the water, automatically provides proper catenary for the pipeline that is being laid. This pivotal system of supporting the elongated frame compensates for roll of the ship as well as pitch of the ship without having additional stress applied to the pipe, which would be the case if the pipe supporting means did not have the pivotal arrangement of this invention.
摘要:
THIS INVENTION RELATES TO A MOORING SYSTEM FOR A FLOATING STRUCTURE. SPECIAL BOUYANCY CHAMBERS SUPPORT THE STRUCTURE, INCLUDING A WORK DECK, ABOVE A BODY OF WATER. THE STRUCTURE IS CONNECTED TO ANCHORS AT THE FLOOR OF THE BODY OF WATER BY ELONGATED MEMBERS SUCH AS CABLES AND PIPES HAVING DIFFERENT ELONGATIONS PER UNIT OF STRESS. THE MAIN ANCHORING LOAD IS CARRIED BY THE CABLES AND THE PIPES ARE USED PRIMARILY IN DRILLING OPERATIONS OR FOR TRANSPORTING PETROLEUM FROM AN UNDERWATER WELL. BECAUSE OF WAVE ACTION, THE FLOATING PLATFORM IS SUBJECT TO VERTICAL HEAVE FORCES. THE MAXIMUM VERTICAL STRESS APPLIED TO THE CABLES CAUSES THEM TO ELONGATE A LENGTH $L. THE RISER PIPE IS INSTALLED UNDER SUFFICIENT COMPRESSION SO THAT IT IS IN A BUCKLED CONFIGURATION WHEN THE FLOATING STRUCTURE IS IN A NEUTRAL POSITION. THE LENGTH OF THE BUCKLED RISER PIPE EXCEEDS THE VERTICAL DISTANCE FROM THE BOUYANCY MEANS TO THE WELL HEAD BY AN AMOUNT EQUAL TO THE MAXIMUM $ OF THE CABLE. AS THE VERTICAL DISTANCE INCREASES BY $L. THE BUCKLED RISER WILL STRAIGHTEN, RATHER THAN ELONGATE, WITHOUT A CHANGE IN AXIAL FORCE. THUS THE BASIC LOAD-CARRYING MEMBER REMAINS THE CABLE. IN A PREFERRED EMBODIMENT THE CABLE IS SLIDEABLY CONNECTED TO THE POINTS ALONG THE BUCKLED RISER PIPE CORRESPONDING TO THE NODES OF THE BUCKLED CONFIGURATION.
摘要:
In a method for recovering petroleum from earth formations, the petroleum is driven through the formation by two banks of material followed by gas. The first bank is a solution of a solid polymer in a mixture of propane and a higher molecular-weight hydrocarbon. The second bank is an enriched gas miscible with the liquid components of the polymer solution.
摘要:
A seismic surveying method utilizes a vibratory source emitting a succession of differing frequency sine waves. Received waves after suitable amplification are passed through a group of narrow filters which separate the various frequency components. After suitable time delays, these components are recombined to present a record similar to that obtained from an explosive single source.
摘要:
Conventional well logs in the past have been recorded to a large extent in analogue form as a visual trace on a strip of paper. With the advent of the digital computer, it is now desired to convert these logs into digital form so that they can be processed in such modern computers. Such well logs are transferred to long strips of precision ruled, perforated paper. A drum with windows placed around its periphery is provided. Means are provided to drive these logs by these windows in a direction parallel to the axis of the drum. At the same time, scanning means are provided to scan by each window. These scanning means include means for measuring the distance between a base line and the log itself. This measurement is converted to a digital representation of the log at that point. Sufficient scanning is done to obtain digital information defining each well log.