Abstract: This paper analyzes the mechanisms under which the hard and brittle shale formations destabilize, introduces the characteristics and application of nano materials, and summarizes the progresses made in the studies of drilling fluid nano material plugging agents, including organic and inorganic nano ...
Abstract: Study on high temperature shale inhibitors is of great importance in satisfying the needs of high temperature deep well drilling and in improving the inhibitive capacity of high temperature water base drilling fluids. A new ultrahigh temperature shale inhibitor, HT-HIB, was studied for its high temp...
Abstract: The Ordovician carbonate rock reservoirs drilled in Tazhong area (Tarim Basin) have complex geology and developed fractures, 50% of which with widths between 20 μm and 400 μm. These fractures have led to frequent lost circulation, well kick and severe gas cut, which in turn resulted in well control ...
Abstract: Mud shales have plenty of micro-fractures which are difficult to plug and seal. Mud filtrates infiltrate swiftly deep into the formation under the action of osmotic pressure, capillary force and differential chemical potential, causing the formation to become unstable. A micro emulsion has been deve...
Abstract: A hydrophilically inhibitive water base drilling fluid has been developed to drill shale gas wells penetrating the Longmaxi Formation. This drilling fluid was formulated with a hydrophilically inhibitive agent CQ-SIA and a high performance lubricant CQLSA. CQ-SIA, the core additive of the formulatio...
Abstract: A comb polymer filter loss reducer, DMP-1, was synthesized through solution polymerization with allyl polyoxyethylene ether 400 (APEG400), acrylamide (AM), and 2-acrylamido-2-methyl propane sulfonic acid (AMPS). DMP-1 was developed in an effort to overcome the deficiencies of presently available hig...
Abstract: Borehole wall destabilization has long been a problem that needs to be solved. A high temperature bridging formation stabilizer QFT, has been developed based on the working mechanism under which formation stabilizers are adsorbed on clay particles and formation minerals. Monomers used in synthesizin...
Abstract: There are many methods available presently for the simulation of micro fractures in Shale. All these methods have limitations, and are unable to trulysimulate the hydration and dispersion processes of shales in contact with water at HTHP conditions. To solve this problem, several simulation methods,...
Abstract: A hydrophobically associating polymer, JD, has been synthesized with long chain alkyl dimethyl allyl ammonium chloride, acrylamide, N-vinyl pyrrolidone and acrylic acid in a certain ratio of initiators and a certain polymerization condition. JD was developed to deal with the difficulties in plugging...
Abstract: Wells drilled in the piedmont area in Kyche, Xinjiang have to penetrate thick salt and gypsum formations, which have complex geology, ultrahigh pressure saltwater with poor distribution patterns in length and breadth, highly varied formation pressures that are difficult to predict. Drilling fluid pr...
Abstract: By changing external conditions, reversible emulsion can vary between oil-in-water emulsion and water-in-oil emulsion to play a better role that is expected. Studies have been conducted on the preparation and stability of reversible emulsions and the effects of acid and base types on them. The studi...
Abstract: Extended reach well technology has been used to produce the natural gas in the offshore area from onshore in developing the Block S located in the east of Sakhalin, Russia. The designed well depth (MD) was 12,000 m (TVD 2,800 m) and the horizontal displacement was about 11,000 m. The ratio of horizo...
Abstract: Well LS25-1S-1 is a deep water HTHP well drilled to 4 448 m, completed at the Meishan Formation. A six-interval well profile was adopted during drilling. The predicted pressure coefficient of the φ212.7 mm target section was 1.70-1.84. Narrow safe drilling window, blowout, lost circulation and the f...
Abstract: The target zones of the Donghai gas field are the Huagang Formation and the Pinghu Formation, whose formation characteristicssuch as poorly cemented sandstone-mudstone interbeds, fractured mud stone and developed coalbeds, are unfavorable to drilling operation. Unstable borehole wall and poor hole c...
Abstract: The success of oil and gas well drilling depends to a large extent on the performance of drilling fluid, whichis greatly affectedby the weighting agent used. A drilling fluid weighted with different weighting agents will perform quite differently during drilling. In laboratory studies, a micron powd...
Abstract: Horizontal well open hole completion is a way of well completion to maximize well production rate. In offshore drilling, well completion is generally done with solids-free drill-in fluid, supplemented with gel-breaking well completion. Direct flowback of drill-in fluid is a technology developed on t...
Abstract: Waste drilling fluids in Changqing gas field are treated with gel-breaking and solid-liquid separation technologies to conform to the environment protection requirements. In gel-breaking the drilling fluids, a new gel-breaking agent, CQPJ-1, was developed to replace the single-purpose, slow and low-...
Abstract: Mud cakes left over on the borehole wall by drilling fluid play a major role in determining the quality of the bonding between cement sheath and formation. Solidification of mud cakes provides a new clue for solving the bonding problem. A new idea of mud cake solidification based on the geopolymer p...
Abstract: A high temperature cement slurry fluid loss reducer, G85L, was synthesized with 2-acrylamido-2-methyl propane sulfonic acid (AMPS), N,N-dimethylacrylamide (DMAM) and fumaric acid (FA) through radical polymerization under the following conditions:AMPS:DMAM:FA=1:0.38:0.08, mass ratio of total monomers...
Abstract: One of the most important purposes of cement sheath study is to establish experimental apparatus and procedure for evaluating the integrity of cement sheath. The working load of cement sheath in a wellbore can be simulated on an artificial cement sheath using equivalent stress method. With the help ...
Abstract: It has been found in laboratory experiment that, a low-density cement slurry of 1.65 g/cm3 (containing 40% sized silica powder) prepared by increasing water/cement ratio to 0.74, had its compressive strength reduced by 20.3%, and the strength measured by ultrasonic method reduced by 50.6% after agin...
Abstract: Hydrophobically associating polymers have found wide applications in oil and gas production because of their unique rheology, high temperature stability and good shear-resistance. A hydrophobically associating polymer HAPAM has recently been synthesized in laboratory with stearyl methacrylate (SMA) ...
Abstract: In fracturing formations with higher fracture pressures, high-density fracturing fluids should be used because low-density ones have difficulties fracturing these formations. Weighting agents for use in fracturing fluids should have good water solubility because the fracturing fluids will go deep in...
Governed by: China National Petroleum Corporation Ltd
Editor-in-Chief:Shi-chun Chen(Engineer Technology Research Institute,BHDC)
Deputy Editor-in-chief:
Gui-juan Wang(Engineer Technology Research Institute,BHDC)Qiang Ren(Engineer Technology Research Institute,BHDC)
Address: Editorial Office of Drilling Fluid and Completion Fluid, Bohai Drilling Engineering Institute, Yanshan South Road, Renqiu City, Hebei Province