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Sampling detection method for underground state of oilfield oil displacement chemical agent

A detection method and technology of chemical agents, which can be used in earth-moving drilling, wellbore/well components, etc., can solve problems such as solution damage, unreal test results, and molecular chain damage.

Inactive Publication Date: 2005-03-16
DAQING OILFIELD CO LTD
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Problems solved by technology

However, the original sampling process will damage the molecular chain of the oil-displacement chemical agent, causing the dissolved gas to escape; it cannot fully reflect the underground working status of the oil-displacement chemical agent; The temperature, pressure and anaerobic sealing conditions of the agent in the oil layer will cause a certain degree of damage to the solution, making the test results untrue

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  • Sampling detection method for underground state of oilfield oil displacement chemical agent
  • Sampling detection method for underground state of oilfield oil displacement chemical agent

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specific Embodiment approach 1

[0005] Specific implementation mode one: (see figure 1 , figure 2 ) The present embodiment realizes by following steps, one, measure the underground pressure and temperature of detected oil well; For the oil well of known downhole pressure, temperature, needn't measure again, take known pressure, temperature as the criterion. 2. Fill the gas chamber 1 of the sampler with high-pressure gas lower than the underground pressure, fill the liquid chamber 2 of the sampler with antifreeze, and push the piston 5 to the end of the sample chamber 3 on the top of the sampler, so that The volume of the sample chamber 3 is zero; the pressure in the gas chamber 1 is 1-2Mpa lower than the underground pressure, such as the underground pressure is 7Mpa, the pressure of the high-pressure gas filled in the gas chamber 1 is 5Mpa, and the high-pressure gas is nitrogen or other inert gas. The antifreeze in the liquid chamber 2 is an antifreeze for ordinary automobiles. 3. Lower the sampler into ...

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Abstract

A sampling detection method for underground state of oilfield oil displacement chemical agent relates to the improvement of oilfield oil displacement chemical agent sample detection method. The invention charges a gas chamber (1) of a sampler with high pressure gas with a pressure lower than the underground pressure, charges a liquid chamber (2) of the sampler with anti-freezing fluid and pushes a piston (5) to the end of a sample chamber (3) at the top of the sampler to make the cubage of the sample chamber (3) to zero; the sampler is then put into oil layer, the polymer solution will push the piston (5) to move to a direction of a piston (4) in the sampler, the anti-freezing fluid in the liquid chamber (2) will flow to the gas chamber (1) through the small hole on the piston (4), the sampling will be finished when the pressure in the sampler is balance with the underground pressure. The sampling detection method for underground state of oilfield oil displacement chemical agent of the invention can detect the sample containing oil displacement chemical agent under the condition of accordant with the underground oil layer environment, holds the sample with the advantages of high temperature, high pressure and no oxygen, and will not damage the sample characteristic, and can truly reflect the underground work status of the oil displacement chemical agent by detection result.

Description

Technical field: [0001] The invention relates to the improvement of a sampling and detection method for an oil-displacement chemical agent in an oil field. Background technique: [0002] Tertiary oil recovery refers to a method in which oilfields use physical, chemical, and biological new technologies to recover oil from tailings after using natural energy for extraction and traditional artificial energy supplementation (water injection, gas injection). This type of oil displacement is mainly through the injection of chemical substances, gas injection (miscible) or microorganisms, etc., thereby changing the displacement and the properties of the oil-water interface or the physical properties of crude oil. At present, the tertiary oil recovery chemical flooding technologies that have been formed in the world include: polymer flooding, surfactant flooding, alkaline water flooding and their compound ASP flooding, etc. With the application of tertiary oil recovery technology, t...

Claims

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Application Information

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IPC IPC(8): E21B49/08
Inventor 郭明日苏延昌高峰张义江
Owner DAQING OILFIELD CO LTD
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