A method for locating the depth of drilling microchip tracers using velocity
A tracer and microchip technology, which is used in earth-moving drilling, wellbore/well components, measurement, etc., can solve the problems of not collecting well depth information and the inability to accurately determine and evaluate the depth of the tracer.
Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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[0010] The present invention solves the technical problem that the depth of the tracer cannot be accurately determined and evaluated in the prior art, that is, in the prior art, when the tracer moves in the well, only the time information is collected, and the well depth information is not collected.
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[0081] Verification test: see Figure 5
[0082] In order to verify the hair surface effect, the verification was carried out in the K2 well, the well depth is H=3132.41m, and the drilling fluid displacement is Q=1.80m 3 / min, tracer diameter d s =0.8cm, the average density of the tracer is ρ s =1.60g / cm 3 , the drilling fluid density is ρ d =1.30g / cm 3 , the effective viscosity of the drilling fluid is μ c =0.88Pa·s.
[0083] ① Determine the time when the tracer reaches the ground, which is recorded as 0, and the time when the tracer runs at a certain point in the well is T i ,T i The value is always less than 0.
[0084] ② Allocation of well sections. According to the difference of the inner and outer diameters of the annulus, the whole well is divided into several well sections. The inner and outer diameters and lengths of the annulus of each well section are respectively d from top to bottom 1 =127.00mm, D 1 =220.52mm, h 1 =2266.62m; d 2 =127.00m, D 2 =215....
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The invention belongs to the field of oil exploration and development, and particularly relates to a method for determining the depths of drilling microchip tracers. The tracers flow along with the flowing of drilling liquid. The method for positioning the depths of the tracers in a well tube comprises the steps of sectioning a whole well according to dimensions of an inner diameter and an outer diameter of an annulus of the well tube, obtaining an upward movement speed of the drilling liquid of each well section and a sliding speed of each tracer according to the flow of the drilling liquid and a downhole physical parameter, and obtaining the actual upward movement speeds of the tracers at all the well sections; obtaining movement displacements of the tracers according to the speed and the running time of the tracers so as to obtain depth positions of the tracers at all the well sections, and finally obtaining the depths of different time tracers, so that the depths of the tracers can be positioned. According to the method disclosed by the invention, abnormal drilling accidents such as well kick, leakage, drill friction to the well wall and drill puncturing can be found in time, the drilling efficiency is improved, and an oil and gas reservoir can be found and evaluated in time.
Description
technical field [0001] The invention belongs to the field of petroleum exploration and development. It involves the research direction of detecting wellbore temperature and pressure in order to improve drilling efficiency and ensure drilling safety in drilling, especially the method of depth determination for drilling microchip tracers. Background technique [0002] ① Drilling parameter measurement plays an important role in ensuring drilling safety [0003] Oil drilling is a high-risk industry. During the drilling process, if a drilling accident occurs, it will cause property damage at least, and casualties at worst. With the increase of well depth, especially the development of various branch wells and horizontal wells, the incidence of drilling accidents and complex situations is getting higher and higher. Drilling engineering accidents such as kick and lost circulation occur to varying degrees in major oil fields in China every year, and these accidents are closely rel...
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IPC IPC(8): E21B47/04
Inventor 杨明清陆黄生张卫李光泉李三国赵文杰
Owner CHINA PETROLEUM & CHEM CORP