Oil-water interface inspection and control method
A technology of oil-water interface and control method, which is applied in earthwork drilling, mining fluid, measurement, etc. It can solve the problems of reducing the production timeliness of brine mining and making cavity, and the cost of on-site construction of pulse neutron logging method is high, so as to prevent environmental damage hidden effect
Inactive Publication Date: 2011-08-17
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
Since the oil-water interface needs to be frequently detected and controlled during the brine production process, the on-site construction cost of the pulsed neutron logging method is very expensive, and the brine production needs to be stopped during the measurement process, which reduces the risk of brine production. cavity production aging
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[0019] The present invention is used in conjunction with an oil-water separation device, which consists of a box body 1, a water inlet valve 2, a water inlet elbow 3, an inner groove 4, an extension groove 5, a vertical baffle 6, an inclined plate 7, a stop valve 8, and a base 9, 10 and drain valve 11, etc. The connection relationship is: the box body 1 is connected to the inner tank 4 and a water inlet valve 2 is welded on the outside, the inner tank 4 is welded on the inside of the box body 1, and there is a water inlet valve 2 on the inside of the inner tank 4. The water inlet elbow 3 with the mouth down is connected to the water inlet valve 2, the top of the inner tank 4 is connected to the extension groove 5, and the end of the extension groove 5 is welded with a vertical baffle 6, and the vertical baffle 6 and the inclined plate 7 Connected, a cut-off valve 8 is installed on one side of the inner tank 4, the bottom of the box body 1 is an inclined surface, and a drain val...
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The invention discloses an oil-water interface test and control method, including the following steps: A, downhole operation: extracting brine and building a cavity through positive circulation technique, lowering an intermediate pipe to a fixed depth of the oil-water interface; B, ground operation: connecting the small valves on a brine extraction pipeline to a water inlet valve through a hose, so as to draw out oil-water mixture; C, oil-water interface testing: diesel oil and natural oil drops which float to the inner surface of an oil-water separating and testing device naturally diffuse and float on an extension slot to form an oil film, and when diesel oil precipitation is visible, the oil-water interface reaches the casing shoe of the intermediate pipe; D, oil-water interface depth control: with the enlarging of the cavity, injecting diesel oil to the downhole cavity periodically to form a stable oil pad layer; and E, oil-water interface depth adjustment: adjusting the depths ofthe intermediate pipe and the central pipe, extracting brine and building a cavity within the range of a new salt bed. The oil-water interface test and control method is simple and clear, reduces construction cost and improves production efficiency.
Description
technical field [0001] The invention relates to the technical field of underground water-soluble mining (salt), and more particularly relates to an oil-water interface inspection and depth control method in the process of underground water-soluble mining (salt) oil injection construction, which is suitable for the production process of mining brine in underground salt mines. Background technique [0002] In the process of mining underground salt mines by water-soluble method, there is a three-pipe brine mining technology and method: through drilling methods, a wellbore of a certain size is drilled to the bottom of the salt layer, and a ground-to-underground tunnel is established. For the channel of the salt layer, the production casing is lowered to the top of the salt layer and cemented with cement, and then the intermediate pipe and the center pipe are lowered to the depth of the salt layer designed for mining, and water injection and brine production are started. The prod...
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IPC IPC(8): E21B43/00E21B47/04E21B47/047
Inventor 杨春和屈丹安李银平施锡林
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI