High-temperature saturated salt resistant fluid loss reducer for water-based drilling fluid

Abstract

The invention discloses a high-temperature saturated salt resistant fluid loss reducer for water-based drilling fluid, and aims at solving the problems that the existing fluid loss reducer for drilling fluid difficultly meets the requirements for high-temperature resistance and high-concentration salt resistance of complex formation. The fluid loss reducer is prepared from the following raw materials: 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, acrylic acid, N-vinyl pyrrolidone, diallyldimethylammonium chloride and the like. The preparation method is simple, the reaction condition is mild, the conversion rate is high, the requirement for equipment and environment is low, and industrial batch production of the fluid loss reducer can be realized easily. The fluid loss reducer can effectively reduce water loss of the drilling fluid, can resist high temperature (230 DEG C) and the saturated salt, and has remarkably superior effect to the varieties of the existing fluid loss reducers.

Description

technical field

[0001] The invention relates to the field of oilfield chemistry, in particular to a high-temperature anti-saturated salt fluid loss additive for water-based drilling fluids, specifically a 230°C high-temperature anti-saturated salt fluid-loss additive for water-based drilling fluids. Background technique

[0002] In recent years, with the development of oil exploration and development to deep formations, the depth of drilling has been increasing. While the drilling depth increases, during the drilling process, complex formations such as salt rock formations and gypsum formations are often encountered, and such formations require drilling fluid treatment agents with better high temperature resistance and high concentration salt resistance. performance. As an important drilling fluid treatment agent, fluid loss reducer can effectively control water loss and also adjust rheological properties. It can form a thin and dense mud cake on the well wall to prevent dr...

Examples

Embodiment 1

[0046] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0047] Take 10kg of distilled water, add 0.5kg of NaHSO to it 3 and 0.5kg of K 2 S 2 o 8 , to trigger the solution.

[0048] Add 45kg of distilled water in the reactor, then add 10kg of 2-acrylamido-2-methylpropanesulfonic acid and 8kg of acrylic acid in the reactor, after stirring and dissolving completely, add 12kg of NaOH in the reactor to adjust The pH value of the solution in the reaction kettle was brought to 10.

[0049] After adjusting the pH value of the solution in the reactor to 10, add 5kg of acrylamide, 5kg of N-vinylpyrrolidone, and 5kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0050] The temperature of the intermediate reaction solution was raised to 45° C., and then the abov...

Embodiment 2

[0053] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0054] Take 50kg of distilled water, add 2.5kg of NaHSO to it 3 , to trigger the solution.

[0055] Add 175kg of distilled water in the reactor, then add 60kg of 2-acrylamido-2-methylpropanesulfonic acid and 45kg of acrylic acid in the reactor, after stirring and dissolving completely, add 75kg of NaOH in the reactor to adjust The pH value of the solution in the reactor was 11.

[0056] After the pH value of the solution in the reactor is adjusted to 10, add 25kg of acrylamide, 30kg of N-vinylpyrrolidone, and 40kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0057] The temperature of the intermediate reaction solution was raised to 50° C., and then the initiation solution prepared in the precedin...

Embodiment 3

[0060] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0061] Take 100kg of distilled water, add 10kg of Na to it 2 SO 3 and 5kg of K 2 S 2 o 8 , to trigger the solution.

[0062] Add 550kg of distilled water in the reactor, then add 80kg of 2-acrylamido-2-methylpropanesulfonic acid and 60kg of acrylic acid in the reactor, after stirring and dissolving completely, add 70kg of NaOH in the reactor to adjust The pH value of the solution in the reaction kettle was brought to 10.

[0063] After adjusting the pH value of the solution in the reactor to 10, add 60kg of acrylamide, 40kg of N-vinylpyrrolidone, and 40kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0064] The temperature of the intermediate reaction solution was raised to 45° C., and then th...

technical field

[0001] The invention relates to the field of oilfield chemistry, in particular to a high-temperature anti-saturated salt fluid loss additive for water-based drilling fluids, specifically a 230°C high-temperature anti-saturated salt fluid-loss additive for water-based drilling fluids. Background technique

[0002] In recent years, with the development of oil exploration and development to deep formations, the depth of drilling has been increasing. While the drilling depth increases, during the drilling process, complex formations such as salt rock formations and gypsum formations are often encountered, and such formations require drilling fluid treatment agents with better high temperature resistance and high concentration salt resistance. performance. As an important drilling fluid treatment agent, fluid loss reducer can effectively control water loss and also adjust rheological properties. It can form a thin and dense mud cake on the well wall to prevent dr...

Examples

Embodiment 1

[0046] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0047] Take 10kg of distilled water, add 0.5kg of NaHSO to it 3 and 0.5kg of K 2 S 2 o 8 , to trigger the solution.

[0048] Add 45kg of distilled water in the reactor, then add 10kg of 2-acrylamido-2-methylpropanesulfonic acid and 8kg of acrylic acid in the reactor, after stirring and dissolving completely, add 12kg of NaOH in the reactor to adjust The pH value of the solution in the reaction kettle was brought to 10.

[0049] After adjusting the pH value of the solution in the reactor to 10, add 5kg of acrylamide, 5kg of N-vinylpyrrolidone, and 5kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0050] The temperature of the intermediate reaction solution was raised to 45° C., and then the abov...

Embodiment 2

[0053] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0054] Take 50kg of distilled water, add 2.5kg of NaHSO to it 3 , to trigger the solution.

[0055] Add 175kg of distilled water in the reactor, then add 60kg of 2-acrylamido-2-methylpropanesulfonic acid and 45kg of acrylic acid in the reactor, after stirring and dissolving completely, add 75kg of NaOH in the reactor to adjust The pH value of the solution in the reactor was 11.

[0056] After the pH value of the solution in the reactor is adjusted to 10, add 25kg of acrylamide, 30kg of N-vinylpyrrolidone, and 40kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0057] The temperature of the intermediate reaction solution was raised to 50° C., and then the initiation solution prepared in the precedin...

Embodiment 3

[0060] A high-temperature anti-saturated salt fluid loss agent for water-based drilling fluid, which can resist high temperature of 230°C and anti-saturated salt, and its preparation process is as follows.

[0061] Take 100kg of distilled water, add 10kg of Na to it 2 SO 3 and 5kg of K 2 S 2 o 8 , to trigger the solution.

[0062] Add 550kg of distilled water in the reactor, then add 80kg of 2-acrylamido-2-methylpropanesulfonic acid and 60kg of acrylic acid in the reactor, after stirring and dissolving completely, add 70kg of NaOH in the reactor to adjust The pH value of the solution in the reaction kettle was brought to 10.

[0063] After adjusting the pH value of the solution in the reactor to 10, add 60kg of acrylamide, 40kg of N-vinylpyrrolidone, and 40kg of diallyldimethylammonium chloride into the reactor, and stir and dissolve to obtain Intermediate reaction solution.

[0064] The temperature of the intermediate reaction solution was raised to 45° C., and then th...