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Plugging agent for clastic rock oil reservoir horizontal well, preparation method and water plugging method

A technology for horizontal wells and clastic rocks, which is applied to the plugging agent of horizontal wells in heterogeneous clastic rock reservoirs and the field of oil well water plugging using the plugging agent. problems, to achieve the effect of reducing pollution and reducing the cost of plugging agent

Active Publication Date: 2014-04-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects of existing plugging agents that are difficult to fully compatible with reservoirs, not recyclable, high cost, limited oil-water selectivity, etc., and provide a plugging agent for horizontal wells in clastic rock reservoirs And the water plugging method, the self-produced crude oil of the oil field and the formation water are used to form an emulsion plugging agent system with different water content. The crude oil can be recovered, which greatly reduces the cost of the plugging agent, and also solves the compatibility problem between the injected plugging agent and the formation. Reduced contamination of the formation
The invention is used for selective water plugging of horizontal wells with high water content, can meet the water plugging requirements of ultra-deep, high-temperature, high-salt, and strongly heterogeneous clastic rock reservoirs, and can meet the needs of special wellbores that cannot be lowered by conventional tools Conditions and wellbore trajectory for high water cut oil well water plugging, to solve the problem of simultaneous oil and water in multiple sections of horizontal wells

Method used

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  • Plugging agent for clastic rock oil reservoir horizontal well, preparation method and water plugging method
  • Plugging agent for clastic rock oil reservoir horizontal well, preparation method and water plugging method
  • Plugging agent for clastic rock oil reservoir horizontal well, preparation method and water plugging method

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preparation example Construction

[0047] A preparation method of the above blocking agent, the method comprising: in parts by weight, adding 0.5-1.5 parts of nonionic emulsifier and 2-4 parts of anionic surfactant to 100 parts of crude oil successively, adding 0-40 parts of water, preferably 20-40 parts, fully stirred until uniform, made into emulsion blocking agent.

[0048] A method for shutting off water in a horizontal well in a clastic rock reservoir, the method comprising: using the above-mentioned plugging agent, according to 6-30m 3 / h displacement, inject 0.4-2.0m per meter horizontal section 3 The amount of plugging agent, the plugging agent is stably injected into the horizontal well through the tubing or casing annulus, and the well is opened for production after 24-72 hours of boredom. In the present invention, a profile control pump or a cement truck can be used to inject the plugging agent into the horizontal well through the oil pipe or the annulus of the oil casing, and a 700 type skid-mounte...

Embodiment 1

[0080] Choose a viscosity of 70mPa.s at 50°C and a density of 0.938g / cm 3 of crude oil. Add 0.5 kg of imidazoline oleate and 2 kg of sodium dodecylbenzene sulfonate in sequence to 100 kg of crude oil, stir well until uniformly dispersed, and make an emulsion liquid blocking agent.

Embodiment 2-41

[0082] The preparation method used in Examples 2-41 is basically the same as that of Example 1. For the examples containing formation water, after the dispersion of crude oil and emulsifier is completed, formation water is added and stirred until uniformly dispersed. See Table 2 for details.

[0083] Table 2

[0084]

[0085]

[0086]

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Abstract

The invention provides a plugging agent for a clastic rock oil reservoir horizontal well, a preparation method and a water plugging method. The plugging agent comprises the following compositions in parts by weight: 100 parts of crude oil, 0.5-1.5 parts of non-ionic emulsifier, 2-4 parts of anionic surfactant, and 0-40 parts of water, preferably, 20-40 parts of water. The plugging agent provided by the invention is applicable to the clastic rock oil reservoir horizontal well with the formation temperature being less than 120 DEG C and formation water salinity being less than 240000 mg / L. The plugging agent can meet the special shaft condition that ordinary tools cannot be placed and realize water plugging on high water content oil well with special well tracks, and further, the problem that water and oil flow out together in multiple segments of the horizontal well is solved.

Description

technical field [0001] The present invention relates to a plugging agent and a method for oil well water plugging using the plugging agent, in particular to a plugging agent suitable for horizontal wells in heterogeneous clastic rock reservoirs and a method for oil well water plugging using the plugging agent. It can meet the conditions of high-temperature and high-salt reservoirs. Background technique [0002] The development of horizontal wells in clastic rock reservoirs has technical advantages such as increasing the oil drainage area of ​​the reservoir and improving the production degree of thin oil and gas layers. One of the most attractive and competitive technologies has been widely used in domestic and foreign oil fields. [0003] Due to the heterogeneity of the physical properties of clastic rock reservoirs, the liquid production in the horizontal section is uneven, and the water body is easy to form a breakthrough from the high permeability and high water saturati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42E21B33/12
Inventor 李子甲吴文明何龙刘广燕李亮詹兆文
Owner CHINA PETROLEUM & CHEM CORP
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