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Chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well

A sensitive, water injection well technology, applied in chemical instruments and methods, wellbore/well components, production fluids, etc., can solve the problems of difficult water injection and high water injection pressure, and achieve the solution of comprehensive chemical plugging removal and pressure reduction and injection increase. Effect

Inactive Publication Date: 2010-05-12
XIAN ZHONGFU KAIHONG GASOLINEEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is, aiming at the particularity of highly sensitive oil layers in ultra-low permeability oilfields (that is, multiple sensitivities exist at the same time), to solve the problem of water injection wells caused by various pollutions in oilfields where multiple sensitivities exist at the same time or separately. High water injection pressure, difficult water injection and other technical problems caused by plugging, damage to oil layers or other factors, provide a chemical depressurization and increased injection technology for water injection wells in highly sensitive oil layers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Well G14-22 in Changqing Ansai Oilfield, Chang 10 oil layer, has multiple sensitivities such as strong alkali sensitivity, strong velocity sensitivity, strong acid sensitivity, moderate salt sensitivity and moderate stress sensitivity.

[0018] A chemical injection is prepared by using acid, alkali, surfactant, and oxidizing agent. The weight ratio of several components is: 10% acid, 15% alkali, 0.2% sulfonate, 3.5% fluorocarbon, and 1% oxidant. , the water balance.

[0019] The date of the measures was June 20, 2009. The water injection data before the measures were: oil pressure 10.3Mpa, casing pressure 10Mpa, injection 25m 3 , actual injection 5m 3 .

[0020] The water injection data after the measures are: oil pressure 8.0Mpa, casing pressure 7.9Mpa, injection 30m 3 , actual injection 30m 3 . The injection effect is obvious, and the water injection pressure is reduced to meet the injection requirements.

[0021] The construction process of the well is continuo...

Embodiment 2

[0022] Example 2 Well Y69-38 in Changqing Jiyuan Oilfield, Chang 2 oil layer, has various sensitivities such as velocity sensitivity, alkali sensitivity and water sensitivity.

[0023] Use acid, alkali, surfactant and oxidizing agent to make chemical injection. The weight ratio of several components is: 25% acid, 3% alkali, 5% sulfonate, 0.1% fluorocarbon, 7% oxidizing agent , the water balance.

[0024] During the pretreatment, the squeeze injection pressure reached 18MPa. When the pre-extrusion pre-acid and the main treatment fluid I and II alternate first, the squeeze injection pressure reached the highest 15-16MPa, indicating that there was relatively serious pollution and blockage in the near wellbore area, and in the pretreatment After treatment, the unblocking effect has been initially seen.

[0025] The effect of the well measures is good, and the damage to the reservoir caused by water sensitivity, alkali sensitivity and velocity sensitivity has been alleviated. The ...

Embodiment 3

[0027] Well W25-07, an injection well in Changqing Ansai Oilfield, and Chang 6 oil layer, have various sensitivities such as velocity sensitivity, acid sensitivity, salt sensitivity and stress sensitivity.

[0028] Use acid, alkali, surface active agent and oxidant to make chemical injection, the weight ratio of several components is: acid 15%, alkali 10%, sulfonate 2.5%, fluorocarbon 1%, oxidant 4% , the water balance.

[0029] Construction situation: the water injection pressure before the measures is high, and the injection volume is 20m 3 / d, the actual injection cannot be made; after the measures are taken, the water injection pressure drops to meet the geological injection requirements.

[0030] From 2008 to 2009, this technology and product were tested in more than 10 wells in a special oil layer that is acid-sensitive, alkali-sensitive, salt-sensitive, velocity-sensitive, and stress-sensitive in Changqing Ansett low-permeability oilfield, with a success rate of 100% ...

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Abstract

The invention relates to a petroleum extraction technology, aiming at a strong sensitivity oil layer water injection well. In the technology, chemical injection agent is prepared by the four components in parts by weight: 10-25% of acid, 3-15% of alkali, 0.3-8.5% of surfactant, 1-7% of oxidant, and the balance water. When in use, an on-site injection manner of segmented plug continuous injection is adopted, the injection pressure is lower than petroleum layer fracture pressure, and the injection speed is controlled to be 150-300L / min based on the output volume. The invention integrates the technical principals of various oil layer plugging relief and oil displacement technologies of acid, alkali, surface active agent, oxidant, autogenous CO2 and the like to generate technical addictive effect, thereby realizing to solve the technical problems of comprehensive chemical plugging relief and pressure decreasing and augmented injection of the strong sensitivity oil layer water injection well.

Description

technical field [0001] The invention relates to an oil extraction technology, in particular to an oil extraction technology for water injection wells in highly sensitive oil reservoirs. Background technique [0002] In the process of oil exploitation, the sensitive damage to the reservoir is caused by the physical-chemical reaction caused by the foreign fluid entering the formation. Reservoir sensitivity includes: velocity sensitivity, water sensitivity, acid sensitivity, salt sensitivity, alkali sensitivity and stress sensitivity. Therefore, reservoir sensitivity is the most important factor for reservoir damage in the development of medium-high water-cut reservoirs. In the process of oilfield water flooding development, due to the incompatibility of injected water with reservoir rock minerals and reservoir fluid, the presence of metabolites such as oil, suspended solids, and microorganisms in the water will cause sensitive physical and chemical changes in the oil layer. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/74C09K8/58C09K8/52
Inventor 李泰余
Owner XIAN ZHONGFU KAIHONG GASOLINEEUM TECH
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