Anti-shear sampling device and sampling method

Abstract

The invention discloses an anti-shear sampling device and a sampling method. The anti-shear sampling device comprises a sample storage device, a liquid inlet pipeline, an exhaust pipeline and a sampling pipeline. The sample storage device is a container with an inner cavity, and the liquid inlet pipeline, the exhaust pipeline and the sampling pipeline are fixedly connected with the sample storage device and communicated with the inner cavity of the sample storage device. A liquid inlet gate is installed in the liquid inlet pipeline, an exhaust gate is installed in the exhaust pipeline, and a sampling gate is installed in the sampling pipeline. In the process of sampling an oilfield profile control plugging agent entering a well, it is needed to close the exhaust gate and the sampling gate, then open the liquid inlet gate and then open the exhaust gate so that fluid in an injection pipeline can enter the sample storage device; it is needed to close the liquid inlet gate and open the sampling gate finally, and sampling can be carried out in the sample storage device. By means of the anti-shear sampling device and the sampling method, the shear influence on the oilfield profile control plugging agent in the sampling process can be effectively relieved, and the consistency of laboratory determination data of a sample and performance parameters of the practical oilfield profile control plugging agent entering a well can be improved.

Description

technical field [0001] The invention relates to the technical field of sampling and monitoring of oil field profile control and plugging agents, in particular to an anti-shear sampler and a sampling method that are applied to the actual well entry sampling monitoring of oil field profile control and plugging agents. Background technique [0002] In the process of oil recovery and production in oil fields, it is necessary to use high-pressure pumps to inject oilfield profile control and plugging agents into oil wells. Most of these plugging agents are macromolecular long-chain structures, and under the action of shearing, the viscosity is likely to be reduced due to chain breakage, which affects the production. Therefore, the viscosity and gelation performance of oilfield profile control and plugging agent are its important technical indicators, and it is particularly important to take samples and monitor them before injecting into oil wells. [0003] For the sampling detecti...

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Problems solved by technology

[0003] For the sampling detection of oilfield profile control plugging agent, there are two conventional sampling methods, one is sampling in the liquid mixing tank, this sampling method does not go through pumping, which reduces the shear during the pumping process, so its viscosity The gel strength and gel strength are greater than the actual value pumped to the wellhead of the oil well; another sampling method is to use a sampling cock to sample after the wellhead of the oil well or the high-pressure pump. Although this sampling method takes into account the shear during the pumping process, However, under the condition of high pressure and high flow rate, due to the large diameter change of the sampling cork, the shear during the sampling process is much greater than the shear during the pumping process, which will greatly reduce the viscosity and gelation performance of the sampled sample.

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