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Lost circulation additive for blocking loss of shallow casing and preparation method thereof

A technology of plugging agent and casing, which is applied in the field of plugging agent and its preparation to effectively block the leakage of shallow casing, which can solve the problems of low plugging success rate and achieve strong adhesion and strong hydrophilicity , the effect of large specific surface area

Inactive Publication Date: 2014-04-30
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the success rate of shallow casing plugging with oil well cement plugging agent is very low, and repeated plugging is required 2 to 3 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.1 part of wood pulp, 2 parts of bentonite, 0.8 part of diatomaceous earth, 0.5 part of CaO and 5 parts of delayed swelling water-absorbing resin (swelling time 10 min).

Embodiment 2

[0029] Weigh 1.5 parts of grass pulp, 5 parts of bentonite, 3 parts of activated carbon, 3 parts of CaO and 2 parts of delayed swelling water-absorbing resin (swelling time 10min).

Embodiment 3

[0031] Weigh 5 parts of bamboo pulp, 0.5 part of bentonite, 0.5 part of metal filings and slag, 1 part of CaO and 0.5 part of delayed swelling water-absorbing resin (expansion time: 10 min).

[0032] Preparation method:

[0033] Add paper fibers to the pre-hydrated bentonite slurry, stir at high speed for 30 minutes, then add diatomite, stir at high speed for 30 minutes, add CaO, continue stirring at high speed for 30 minutes, finally add delayed swelling water-absorbing resin, stir at low speed for 30 minutes, and obtain plugging slurry .

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Abstract

The invention discloses a lost circulation additive for blocking loss of a shallow casing. The los circulation additive is prepared from the following components in parts by weight: 0.1-5 parts of rapid filtration fiber, 0.5-5 parts of bentonite, 0.5-3 parts of filter aid, 0.5-3 parts of enhancer and 0.5-2 parts of delayed expansion plugging agent. The lost circulation additive has high dehydration characteristics, and can effectively resist dilution of formation water. A main component natural plant fiber has strong hydrophily and large specific surface area, so that the formed plugged zone has stronger adhesive strength on the water-wetted rock surface, the plugged zone can be effectively prevented from being damaged due to flow-back of a leakage layer, delayed expansion particles in the lost circulation additive can absorb water to expand after a solid-phase plugged zone is formed, the strength of the plugged zone is further enhanced, and an effective barrier is built for subsequent cement cementing.

Description

technical field [0001] The invention relates to the technical field of oil drilling plugging, in particular to a plugging agent for effectively plugging shallow casing leakage and a preparation method thereof. Background technique [0002] Shallow casing leakage is a common problem in old oilfields, which is difficult to control and requires high investment costs. At present, there are more and more shallow casing leakage wells, and the treatment mainly adopts casing replacement and plugging. Due to the high cost of casing replacement, plugging is often used to treat shallow leakage on site. However, the success rate of shallow casing plugging with oil well cement plugging agent is very low, and repeated plugging is required 2 to 3 times. The plugging of leakage wells with shallow casing has become a technical problem in field construction. Contents of the invention [0003] An object of the present invention is to provide a leak-stopping agent that can effectively seal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/44C09K2208/08
Inventor 刘学玲郝惠军刘艳郭明红薛莉侯士东
Owner CNPC BOHAI DRILLING ENG
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