Plugging agent for drilling fluid and protecting low percolation reservoir

A plugging agent and drilling fluid technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult particle size of plugging agents, lack of research on low-permeability reservoirs, and inability to form internal mud cakes. , to achieve the effect of low price, good blocking effect and shallow damage depth

Active Publication Date: 2011-07-20
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the usual practice is to reduce the invasion depth by adding plugging agents into the drilling fluid; while conventional plugging agents are mainly aimed at medium-high permeability cores, and for low-permeability reservoirs with small pore throats, conventional plugging agents The particle size is difficult to match w

Method used

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  • Plugging agent for drilling fluid and protecting low percolation reservoir
  • Plugging agent for drilling fluid and protecting low percolation reservoir
  • Plugging agent for drilling fluid and protecting low percolation reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 30 parts of acid-soluble fiber, 5 parts of oil-soluble resin, 40 parts of acid-soluble deformable particles, 10 parts of high-temperature-resistant natural small molecule materials, 15 parts of calcium carbonate, and then add 15 parts of water, in a mixer at a temperature of 80 ° C After 30 minutes of compound reaction, it is dried, packaged and made into a low-permeability reservoir plugging agent for drilling fluid with a specific ratio.

[0023] The products formed by this process are suitable for 0.1~1×10-3μm 2 Reservoir core plugging flowback:

[0024]

[0025] In the present invention, the acid-soluble fiber adopts kapok staple fiber and its modified products, the oil-soluble resin adopts polyvinyl alcohol oil-soluble resin, and the acid-soluble deformable particles adopt AMPS / AM / DMAM copolymer, which is a high-temperature-resistant natural small molecule The material is humic acid modified material.

Embodiment 2

[0027] Take 20 parts of acid-soluble fiber, 10 parts of oil-soluble resin, 50 parts of acid-soluble deformable particles, 5 parts of high-temperature-resistant natural small molecule materials, 10 parts of calcium carbonate, and then add 25 parts of water. After compounding for 60 minutes, it is dried, packaged and made into a low-permeability reservoir plugging agent for drilling fluid with a specific ratio.

[0028] Wherein, the material that each component adopts is the same as embodiment 1.

[0029] The products formed by this process are suitable for 10~50×10-3μm 2 Reservoir core plugging flowback:

[0030]

Embodiment 3

[0032] Take 10 parts of acid-soluble fiber, 10 parts of oil-soluble resin, 60 parts of acid-soluble deformable particles, 5 parts of high-temperature-resistant natural small molecule materials, 10 parts of calcium carbonate, and then add 20 parts of water. After compounding for 40 minutes, it is dried, packaged and made into a low-permeability reservoir plugging agent for drilling fluid with a specific ratio.

[0033] Wherein, the material that each component adopts is the same as embodiment 1.

[0034] The products formed by this process are suitable for 1~10×10-3μm 2 Reservoir core plugging flowback:

[0035]

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Abstract

The invention discloses a plugging agent for a drilling fluid and protecting a low percolation reservoir, comprising the following components of: 10-40 parts of acid-soluble fiber, 5-10 parts of oil-soluble resin, 30-60 parts of acid-soluble deformed particles, 5-10 parts of high-temperature resistant natural small molecule materials and 10-15 parts of calcium carbonate. The basic component of the plugging agent is the acid-soluble fiber which is swelled and soft, has good tenacity and can expand by adsorbing partial moisture, and the like in the drilling fluid to form a meshy structure so as to form plugging on a hole throat under the action of flowing pressure. In addition, other components in the plugging agent, such as the deformed particles, the natural small molecule materials and the calcium carbonate can combine with the fiber to play a rapid plugging role, and therefore, the plugging agent has low damage depth on the reservoir. The plugging agent can be matched with the radius of the hole throat of the low percolation reservoir according to the regulation on the radius of the hole throat of a low percolation core. A drilling fluid system using the plugging agent as the main plugging material has the dynamic core filtration rate not more than 0.1ml/10min at high temperature and high pressure.

Description

technical field [0001] The invention belongs to temporary plugging material for petroleum drilling fluid. Background technique [0002] In the process of oil and gas field development, drilling fluid will inevitably enter the reservoir. For the development of oil and gas fields in low-permeability reservoirs, it has brought great difficulties. For low-permeability reservoirs with severe drilling fluid filtrate damage, reserve estimation is often inaccurate and productivity is extremely low or even non-productive. [0003] According to the comprehensive analysis, it is caused by the high flow resistance of the low-permeability reservoir itself, the damage caused by the drilling fluid to the low-permeability reservoir, and the blockage of the pore throat by solid phase invasion. [0004] In view of the above problems, the usual practice is to reduce the invasion depth by adding plugging agents into the drilling fluid; while conventional plugging agents are mainly aimed at me...

Claims

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Application Information

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IPC IPC(8): C09K8/035
Inventor 徐博韬王健刘兆华苗海龙李松
Owner CHINA NAT OFFSHORE OIL CORP
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