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Ground Anchor High Temperature Condition
Jun 01, 2017

Ground Anchor Heavy oil, also known as heavy fuel, because of its high viscosity, poor fluidity, even in the reservoir conditions can not flow, so the use of General conventional mining method is difficult to work. Steam injection is the most effective and extensive method for heavy oil production at present. When the heavy oil is produced by steam injection, the casing will be severely tested due to the high temperature during the production period, and the tests are as follows: first, the casing is heated and stretched, Ground Anchor and the internal compressive stress is produced. When the compressive stress exceeds the yield limit of the casing material, the casing may break and damage, and secondly, when the steam is injected, the normal load extends from the tensile to the compression change. After the steam is stopped, the temperature is greatly reduced and the tensile begins to function. The repeated changes will result in the leakage of the coupling and the breakage of the thread. Finally, Ground Anchor the higher temperature will have an effect on the strength of the cement stone. When the temperature rises, the cement stone will collapse and lose the support sealing effect on the casing. Prestressed cementing Technology: It is to apply a certain pretension to the casing string in the well before cementing or injecting cement to reduce or cancel the casing elongation caused by the thermal stress in the steam injection, so as to prevent the damage of the oil well, Ground Anchor increase the sealing length of the casing and even reach the whole well casing seal. In order to be able to apply pretension to the casing string, it is necessary to secure the lower end of the casing to the wall. In this way, we need a tool to secure the casing string, called "anchor"

The anchor position is positioned before the rubber plug is pressed, cementing plug pressure for 12-18mpa, that is, can make the rubber plug to promote linkage, open the anchor Claw, the anchor claw to eat into the stratum, ground anchor and stratum anchoring, in the case of maintaining pressure, with the rig big hook-and-lift casing to the design of the prestress value, and then fixed wellhead casing. If a sitting is unsuccessful, you can unload it, move it slowly or rotate it to another position and then hold it down again. Ground Anchor Its main features: (1) the upper and lower end of the anchor is API casing oblong buckle or partial ladder buckle, it is convenient to connect with the casing string, (2) the ground anchor is connected to the cementing plug resistance, and does not affect the installation of other cementing accessories; (3) After the casing is finished, Ground Anchor the drilling fluid can be drilled into the normal circulation, or in the middle of the cycle, and will not affect the work after the anchor; (4) The casing, water injection mud, slurry and other operations according to the conventional cementing operation requirements; (5) pressure after the touch, with the drilling rig hoisting equipment for prestressing, Do not need to acquire special equipment after the pressure cementing plug can be self-locking, to prevent rubber stopper back; (6) complex structure, inconvenient operation. (7) The Anchor Claw can be reset, in the case of a sitting hanging unsuccessful, Ground Anchor can be relieved after the replacement of the seat hang; (8) The anchor claw of the type ground anchor is protruding from the outer surface of the body, and the first time the suspension is unsuccessful, it will affect the rotation transposition; in soft stratum, three of the anchor claws are difficult to produce enough solid strength to resist the tensile force of the prestress cementing.





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