Shear pin packer use common problems and causes - education, industry
Abstract: The shear pin packer structure and working principle of the shear pin packer in the cased hole straddle tests and pressure suction drain after seeking the role of production, an example of the shear pin closure Packer used to analyze issues arising from the same time, puts forward solutions and preventive measures, provide a reference for the construction.
Keywords: structural principle of the reasons for loss of sealing solutions 1, cutting off a basic overview of the packer 1.1 shear pin packer structure and working principle Shear pin packer body from the by-pass, sealing devices and cutting marketing agencies etc. (see Figure 1-1 below), can be used to operate independently, seated on demand, to treat ground segment for accurate measurement, reliable interval seal, for the realization of the more than two analytes with a well cross-section of septum formation pressure testing and pumping liquid discharge after the request to provide a reliable production Technology Means of its simple structure, easy to operate. The upper part of the bypass seal and the same casing packer slips, the lower part of the structure by shear pin, when the need for decentralization of string when seated shear shear pin can be realized seated. Testing pipe or drain under the request string to the intended location of production, the rotating string when the packer slips take to win the title, continues to add high compression loads, the shear pin shear pin packer cut, shear pin packer to packer cross-section of the test layer testing and fracturing layer separated liquid discharge requirements of production, re-opened when the last column can be reopened to mention.
1.2 the role of shear pin After the next test or pressure pumping liquid discharge requirements during the middle column, the upper column of the weight acting on the shear pin on the lower tool and drive down to protect the packer rubber tube from compression, in a good state to the purpose here; sit closure, the upper string weight applied through the shear pin to sit under the packer seal. Then, cut off cut, spindle down, compressed plastic tube to sit letters (upper packer packer). Clearly, the role of shear pin has two: one to protect the next test string from compressed plastic tube, in good condition to achieve the purpose under the layer; second time to the next packer packer packer to provide a reliable power ensure that the first sitting under the packer seal. If the next course of agitation or Difficult drilling pressure than shear pin shear stress, shear pin cut, continue to the next column, under the action of the lower tool friction, spindle down (off bypass) to promote the lower cones Crimping Tools down, so that expansion of rubber tube compression, friction and damage, the Packers take strict closures, resulting in production testing or drain failure demand. Even if the shear pin packer rubber tube is not damaged, may lead to closure under the Packers sit lax, because sit down while the packer seal, seal force is not enough to sit.
1.3 shear pin packer common string structure 1.3.1 shear pin packer for cased hole test the inter-compartment column chart Shear pin and slip packer packer used in conjunction with a heavy middle between the two sieve, commonly used in the cased hole testing the inter-compartment (as shown in Figure 1-2).
1.3.2 shear pin packer for cased hole production demand pressure liquid column chart back
Shear pin packer and the packer with the use of kava, the two middle sieve with sand, and they used the pressure in the cased hole seeking rear fluid production (as shown in Figure 1-3).
2, shear pin packer, and causes of use FAQs 2.1 packer cut off well in the test problems and the reasons for the use of
2.1.1 shear pin Packers midway
× × Well, sequence C2-1 layer, using MFE ( ) test string test to obtain fluid properties and capacity. Column under test to 148 hours midway slowly reopened on the mentioned column, go to the next column to the desired location, measure the beginning of Hydrostatic Pressure for 10min, annular surface stability, and can not determine column leakage, early open wells, annular liquid drop, open wells shut after 10min, after shut-0.6m3 surface irrigation to the annulus to the well, then adjust the fuel pipe packer short position open well again soon disappear annular surface can be concluded that loss of shear pin packer seal, cut off from the string found packer rubber cones damaged, causing the packer does not seal, test fails.
I am an expert from China Building Materials, usually analyzes all kind of industries situation, such as wholesale purse frames , wholesale leather wallets.