Application of detector (for acquiring underground oil-water interfaces) controlled by portable computer
A portable computer, oil-water interface technology, applied in construction and other directions, can solve the problems of sensor pollution, detection sensor length, sensor pollution increase, etc.
Active Publication Date: 2014-08-06
PETROCHINA CO LTD
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Problems solved by technology
Due to the small radius of the annular space between the intermediate pipe where the composite cable is installed and the well wall, the composite cable with a larger diameter is easily damaged during the downhole process, so generally only three single-core armored cables can be used in practical applications. The composite cable twisted together is connected to the corresponding three downhole detection sensors, which limits the application of more detection sensors
Third, several technical indicators of the downhole detection sensor have not fully met the requirements of downhole work, mainly: the constant current value of the constant current source circuit of the detection circuit is too small, which is not conducive to identifying sensor pollution and poor anti-interference ability; the detection sensor is made of stainless steel The distance between the detection contacts is small, although it is beneficial to improve the measurement accuracy, it is also not conducive to identifying the contamination of the detection sensor during the detection; the detection sensor is long, although it has a large measurement range, it also exceeds the actual engineering detection requirements At the same time, due to the relatively large number of detection points on it, the sensor pollution increases in actual detection applications, which is not conducive to identifying the position of the oil-water interface
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[0011] figure 1 Schematic diagram of using a portable computer to control and collect downhole oil-water interface detectors to detect oil-water interfaces during the construction of a salt-cavern gas storage cavity. In the figure, water is continuously injected into the salt layer through the central pipe 11 to dissolve the salt layer, and then the brine containing salt is continuously discharged to the ground through the annulus between the central pipe 11 and the intermediate pipe 10 to achieve the purpose of creating a cavity in the salt layer. In order to control the shape of the cavity formed by dissolving the salt layer in the salt layer, it is necessary to inject diesel oil as a retarding solvent into the annulus between the intermediate pipe 11 and the well wall 12 to a predetermined depth in the salt layer. The salt layer below this depth can be dissolved, but the salt layer above this depth will not dissolve, thus forming a cavity in the salt layer with a predetermi...
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The invention relates to the application of a detector (for acquiring underground oil-water interfaces) controlled by a portable computer, and the application is implemented through the following steps: firstly, connecting a J8 of a USB8-route relay output module, connecting J1-J6 relays, VI1-VI6 modules and parallelly-connected resistors R1-R6, and connecting a minus 9V negative end and detection current channels of a detection sensors; arranging the detection sensors from bottom to top; converting current signals flowing through the resistors into voltage signals; when a detected medium is diesel or nitrogen, meaning that no current passes through a constant current source circuit; when the detected medium is brine, meaning that a current passes through the constant current source circuit; converting the voltage signals into current signals, then carrying out the following operations on the current signals: the current signals are added, the sum of current is divided by a constant current value and then multiplied by a spacing between stainless steel contact points, and then the obtained value is added with a depth value corresponding to the stainless steel contact points so as to obtain the height value of an oil-water interface; selecting a-1 8V high-voltage detecting power supply, and repeating the detection process; and when the two obtained results are inconsistent, meaning that salt membrane pollution exists on the surfaces of the detection sensors, and correcting the errors caused by the pollution.
Description
technical field [0001] The invention relates to the application of a downhole oil-water interface detector controlled by a portable computer. Background technique [0002] The existing protective layer interface detector consists of ground detection equipment and downhole detection sensors. The ground detection equipment is connected to the downhole detection sensor through a composite cable composed of 3-5 single-core armored cables twisted together. Each single-core armored cable is respectively connected to a downhole sensor fixed on the intermediate pipe. [0003] There are three deficiencies in the existing detection technology. First, because there is generally no AC power supply in the cavity-forming well site, the ground detection equipment can only use ordinary current detection instruments to detect and record manually, and the automatic control and collection by computer cannot be realized. Second, during the construction of the cavity, according to the engineer...
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IPC IPC(8): E21B47/047
Inventor 杨海军申瑞臣屈丹安吴国明李龙田中兰徐宝财段冲袁光杰巴金红杨松李建君路立君史辉屈平袁坤李萍
Owner PETROCHINA CO LTD