Development and field application of downhole crosslinking plugging agent

2021 ◽  
Vol 11 (11) ◽  
pp. 1887-1891
Author(s):  
Jie Feng ◽  
Lihui Zheng ◽  
You Hao ◽  
Baotong Hui ◽  
Hong Yang ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Salt Water ◽  
Crosslinking Agent ◽  
High Strength ◽  
Underground Water ◽  
Field Application ◽  
Polymer Gel ◽  
Cement Slurry ◽  
Construction Period ◽  
Strong Ability

There were mainly cement slurry, bridge plugging and polymer gel plugging materials for fracture loss circulation and fractured/caved loss circulation. The downhole crosslinking plugging agent was researched for the plugging agents’ respective limitations leaded to low success rate of plugging and longer construction period. This kind of plug agent is consistent with emulsion, phase inversion agent and crosslinking agent. It could form a high strength elastomer when the plug agent is pumped into the leaking layer and mixed with a certain amount of water. The elastomer with strong ability could offer good resident ability to reduce cement slurry thickening by underground water and plugging mud, and increased the ratio of success. The experimental results showed that crosslinking time wasn’t affected by temperature, salt water, drilling cuttings, bentonite mud and other pollutants. The plug agent has been successfully used in several wells of the sixth block in Sudan.

200 and Counting: Unlocking CBM Potential with High-Strength, Low-Density Cement Slurry

2017 ◽  
Author(s):  
Dharmesh Talong ◽  
Animesh Kumar ◽  
Arindam Sarma ◽  
Kuhu Priyamvada ◽  
Vaibhav Tyagi ◽  
...  
Keyword(s):  
High Strength ◽  
Low Density ◽  
Cement Slurry

A Study of Downhole Drillable Pulsing Cementing Device with Low Frequency Self-Excited Hydraulic Oscillation and its Field Application

2012 ◽  
Vol 450-451 ◽  
pp. 1536-1539
Author(s):  
Cui Ping Nie ◽  
Deng Sheng Ye
Keyword(s):  
Setting Time ◽  
Low Frequency ◽  
Field Application ◽  
Displacement Efficiency ◽  
Cement Slurry ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Gas Well ◽  
Hydraulic Oscillation ◽  
Injection Technology

Abstract: Usually we pay more attention on how to improve gas well cementing quality in engineering design and field operations, and there are so many studies on cement agents but few researches on cement slurry injection technology. The field practice proved that conventional cementing technology can not ensure the cementing quality especially in gas well and some abnormal pressure wells. Most of the study is concentrated on cement agents and some cementing aspects such as wellbore condition, casing centralization etc. All the factors analysis on cementing quality has pointed out that a combination of good agents and suitable measurements can improve cementing quality effectively. The essential factor in cementing is to enhance the displacement efficiency, but normal hole condition and casing centralization are the fundamental for cementing only. Pulsing cementing is the technology that it can improve the displacement efficiency especially in reservoir well interval, also it can shorten the period from initial to ultimate setting time for cement slurry or improve thickening characteristics, and then to inhibit the potential gas or water channeling. Based on systematically research, aiming at improving in 7″ liner cementing, where there are multi gas reservoirs in long interval in SiChuan special gas field, well was completed with upper 7″ liner and down lower 5″ liner, poor cementing bonding before this time. So we stressed on the study of a downhole low frequency self-excited hydraulic oscillation pulsing cementing drillable device and its application, its successful field utilization proved that it is an innovative tool, and it can improve cementing quality obviously.

scholarly journals Formulation Development of High Strength Gel System and Evaluation on Profile Control Performance for High Salinity and Low Permeability Fractured Reservoir

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Chengli Zhang ◽  
Guodong Qu ◽  
Guoliang Song
Keyword(s):  
High Salinity ◽  
Crosslinking Agent ◽  
High Strength ◽  
Gel Strength ◽  
Water Flooding ◽  
Low Permeability ◽  
Control Performance ◽  
Formulation Development ◽  
Profile Control ◽  
Gel System

For the large pores and cracks of reservoirs with low temperatures, high salinity, and low permeability, a new type of high strength gel ABP system is developed in this paper. The defects of conventional gels such as weak gel strength, no gelling, and easy dehydration are overcome under the conditions of low temperature and high salinity. The temperature and salt resistance, plugging characteristics, and EOR of the gel system are studied. Under the condition of 32°C and 29500 mg/L salinity, the ABP system formulation is for 0.3% crosslinking agent A + 0.09% coagulant B + 3500 mg/L polymer solution P. The results show that when the temperature was increased, the delayed crosslinking time of the system was shortened and the gel strength was increased. The good plugging characteristics of the ABP system were reached, and the plugging rate was greater than 99% in cores with different permeability. A good profile control performance was achieved, and the recovery rate was improved by 19.27% on the basis of water flooding. In the practical application of the gel system, the salinity of formation water and the permeability of fractures are necessary to determine the appropriate formulation.

In-Field Application of Steel Strip Reinforcement for Pipeline External Rehabilitation

2010 ◽  
Author(s):  
Nicholas J. Venero ◽  
Tim J. M. Bond ◽  
Raymond N. Burke ◽  
David J. Miles
Keyword(s):  
Steel Strip ◽  
New Technology ◽  
High Strength ◽  
Field Application ◽  
Operating Conditions ◽  
Operating Pressure ◽  
Precise Control ◽  
Ultra High Strength Steel ◽  
Structural Adhesive ◽  
Pipeline Design

A new technology for external rehabilitation of pipelines, known as XHab™, has been developed. This method involves wrapping multiple layers of ultra-high strength steel (UHSS) strip in a helical form continuously over an extended length of pipeline using a dedicated forming and wrapping machine. The reinforcement afforded by the strip can be used to bring a defective section of pipe (e.g. externally corroded or dented) back to its original allowable operating conditions, or even to increase the allowable operating pressure if the desired operating conditions exceed the original pipeline design limits. This paper describes the design, manufacture and testing process for a self-propelled wrapping machine for in-field rehabilitation. The wrapping apparatus consists of several major components including an opening sufficiently wide to receive the pipe, a movement assembly, a winding head, a preforming device, an accumulator and an oscillating adhesive applicator. The wrapping apparatus uses the winding head to wrap the reinforcing steel strip around the pipe. The movement assembly uses a pair of tracks in contact with the pipe to drive the wrapping apparatus along which enables helical wrapping of the reinforcing strip material. The oscillating adhesive assembly applies structural adhesive to the pipe immediately before the strip is wound. The winding head, motive assembly and adhesive applicator are electronically synchronized to one another to enable precise control of pitch and adhesive volume. The paper also describes the field application of XHab including mobilization/demobilization of equipment and interaction with other rehabilitation equipment, as well as specific aspects such as initiation and termination of wrapping, protection of rehabilitated area and implementation of cathodic protection.

Steel Girder Bridge with RC Deck Retrofit From Non-Composite to Composite Behaviour

2016 ◽  
Author(s):  
Abheetha Peiris ◽  
Issam Elias Harik
Keyword(s):  
Field Tests ◽  
High Strength ◽  
The United States ◽  
Field Application ◽  
Steel Girder ◽  
Shear Connectors ◽  
Before And After ◽  
Steel Girder Bridge ◽  
Girder Bridge ◽  
Concrete Deck

In the past, a number of steel girder-reinforced concrete deck bridges on county roads in the United States have been built as non-composite. Most of these bridges currently have load postings limiting the capacity of bus and truck loads on their roadways. Recent research showed that post installed high strength bolts could be used as shear connectors in rehabilitation work to achieve partial composite design by deploying 30% to 50% of the connectors typically required for a full composite design. This paper presents details on the analysis, design, and field application of post-installed shear connectors on a non-composite concrete deck steel girder bridge in Kentucky. In order to minimize traffic disruption and construction costs, the shear connectors were inserted on the bottom side of the deck through the top flange of the steel girder. While the load rating increased by 132%, field tests conducted before and after installation of the shear connectors showed that the bridge's live load deflections were reduced by more than 27%.

Deepstar Hull Fabrication

1965 ◽  
Vol 2 (04) ◽  
pp. 360-369
Author(s):  
George F. Gayer
Keyword(s):  
Salt Water ◽  
Water Environment ◽  
Welding Process ◽  
High Strength ◽  
Automatic Welding ◽  
Electric Motors ◽  
Camera Port ◽  
Ac Power ◽  
Welding Alloy ◽  
Private Venture

Deepstar is a self-propelled, manned vehicle for deep-sea research. It is being built as a private venture by Westinghouse Underseas Division, Baltimore, under a technical exchange license with Captain Cousteau and the OFRS (Office Francais de Recherches Sous-Marines) of Marseilles, France. Deepstar is designed to carry a crew of three to depths of 4000 ft for periods up to 24 hr. It is powered by two 4½-hpbattery-operated electric motors which propel it at about 3 knots, with a maximum range of about 20 miles. Overall dimensions of the vehicle are 13 ft long by 7 ft high by 11½ft wide over the fairing. The pressure sphere which houses the crew was built for our Baltimore Underseas Division by Westinghouse, Sunnyvale Marine Division. It measures 70 in. od and was fabricated from two hemispheres of high-strength steel. These hemispheres were spun from alloy plates 1?in. and then machined both inside and outside to 1.2 in. thick. Accurate machining was essential to maintain the sphericity required for pressure stability. After machining, the two hemispheres were welded together by an automatic welding process. The sphere has a total of 11 penetrations through the shell, including an access hatch, 2 viewports, a camera port, 2 electrical passages and 5 shaft openings. Reinforcements for the larger openings were made by welding alloy-steel forgings into the shell. Small openings were reinforced by weld metal buildup through which holes were drilled. All reinforcements were then machined to provide accurate penetrations and sealing surfaces. An extensive metallurgical testing program was conducted to insure that all material and welding used in the sphere had the strength and toughness required for operation at maximum depths. Pressure tests have been conducted in a chamber to 1.2 maximum operating depth. Sunnyvale also made the electric motors for Deepstar. These free-flooded ac motors are suspended outside the pressure hull. Unusual problems solved by special processing included electrical insulation in the salt water environment and water-lubricated bearings. AC power for the motors is provided from the batteries through a rotary inverter with semi-conductor controls.

Synthesis and performance of a self crosslinkable acrylate copolymer with high compatibility for an oil well cement modifier

2014 ◽  
Vol 34 (5) ◽  
pp. 405-413
Author(s):  
Xianru He ◽  
Qian Chen ◽  
Chunhui Feng ◽  
Liang Wang ◽  
Hailong Hou
Keyword(s):  
High Performance ◽  
Oil And Gas ◽  
High Strength ◽  
Ammonium Persulfate ◽  
Fluid Loss ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Well Cement ◽  
Loss Control

Abstract High performance cement slurry polymer modifiers are increasingly in demand in the cementing process of oil and gas. A new polymer modifier with outstanding fluid loss control and high strength and toughness was synthesized by the main monomers butyl acrylate (BA), methyl methacrylate (MMA), acrylamide (AM), the functional monomers vinyltriethoxysilane (VTS), glycidyl methacrylate (GMA) and the initiator of ammonium persulfate (APS) through emulsion polymerization. By using Fourier transform infrared (FTIR) spectrometer, a laser particle analyzer, a scanning electron microscope and a differential scanning calorimeter, we studied the mechanism of fluid loss control and microstructure of polymer latex cement slurries. The experimental results showed that the copolymer could be crosslinked at 160°C and have the lowest fluid loss control, 12 ml, when the polymer content reached 5%. Acrylate latex modified by the silane coupling agent VTS had excellent performance on fluid loss control, as well as mechanical properties for oil well cement. These results have a potential significant value for the development of a new polymer cement modifier with high thermal stability and durability.

scholarly journals Bending of high strength polymer gel in an electric field.

1989 ◽  
Vol 46 (11) ◽  
pp. 709-713 ◽  
Author(s):  
Tohru SHIGA ◽  
Yoshiharu HIROSE ◽  
Akane OKADA ◽  
Toshio KURAUCHI
Keyword(s):  
Electric Field ◽  
High Strength ◽  
Polymer Gel
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